Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dcc5260c7aab84…

MALICIOUS

PDF

32.7 KB Created: 2020-04-10 04:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c6c10756633033e2f0a4b13fb473b00f SHA-1: e2a58c20b236101f0b356d72a1b1cc959e980d10 SHA-256: b6dcc5260c7aab8483b79e452591199f8a7e0a70f544d137eb3da798facccebc
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body primarily contains metadata and the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://anilmotors.net/uploads/1/3/1/4/131437878/131437878.html#safety+1st+alpha+omega+elite+air+car+seat
    • http://ce-education.com/uploads/1/3/0/7/130776177/893371.pdf
    • http://abbottmobileandsteamcleaning.com/uploads/1/3/0/4/130483937/3071755.pdf
    • http://thecscllc.com/uploads/1/3/0/3/130323934/ed4ea49.pdf
    • http://ssfamily.org/uploads/1/3/1/4/131483337/7984131.pdf
    • http://amy-vu.com/uploads/1/3/0/7/130739313/2194284.pdf
    • http://marbledsilkartbyc.com/uploads/1/3/0/2/130271195/a8c5babb.pdf
    • http://frankmanningmft.com/uploads/1/3/0/7/130738527/gelozokugape.pdf
    • http://goldstarcleaningfirst.com/uploads/1/3/0/4/130477490/cc8096.pdf
    • http://barbarareadelcpc.com/uploads/1/3/0/5/130551229/7853121.pdf
    • http://southerndixieutah.com/uploads/1/3/0/6/130604595/pesogenami.pdf
    • http://danarideoutpace.com/uploads/1/3/1/3/131398564/texiwelarigal-lexojuzi-fujav-tutidesik.pdf
    • http://kfhaccounts.com/uploads/1/3/0/2/130289233/damajesoda.pdf
    • http://kcccae.org/uploads/1/3/0/7/130740589/5c4bce87a8.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000551e.bin
f4d2a4578b1b27fefc38344d56714758391af6ec413af096894d17f250e17931		 pdf-font-stream PDF embedded font (sfnt) at offset 0x551E 7916 bytes

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